#include "EvenLoopThread.h"
#include "EventLoop.h"

EventLoopThread::EventLoopThread(const ThreadInitCallback& cb,
    const std::string &name)
    :loop_(nullptr)
    ,exiting_(false)
    ,thread_(std::bind(&EventLoopThread::threadFunc,this),name)
    ,mutex_()
    ,cond_()
    ,callback_(cb)
{

}

EventLoopThread::~EventLoopThread()
{
    exiting_ = true;
    if(loop_ != nullptr)
    {
        loop_->quit();
        thread_.join();
    }
}

EventLoop* EventLoopThread::startLoop()
{
    // 新线程执行里面的方法
    thread_.start(); // 启动底层的新线程

    // 走到这，主线程
    EventLoop* loop = nullptr;
    {
        std::unique_lock<std::mutex> lock(mutex_);
        while(loop_ == nullptr)
        {
            cond_.wait(lock);
        }
        loop = loop_;
    }
    return loop;
}

// 下面这个方法，是在单独的新线程里面运行的
void EventLoopThread::threadFunc()
{
    EventLoop loop; // 创建一个独立的eventloop，和上面的线程是一一对应的，one loop per thread

    if(callback_)
    {
        callback_(&loop);
    }

    {
        std::unique_lock<std::mutex> lock(mutex_);
        loop_ = &loop;
        cond_.notify_one();
    }

    loop.loop(); // EventLoop loop => Poller.poll
    std::unique_lock<std::mutex> lock(mutex_);
    loop_ = nullptr;
}